Study in Optical and Mechanical Properties of Nd3+, Y3+: SrF2 Transparent Ceramics Prepared by Hot-Pressing and Hot-Forming Techniques

Abstract

Nd3+, Y3+: SrF2 transparent ceramics were successfully synthesized by two methods: hot-forming and hot-pressing techniques. The mechanical properties and optical properties of the hot-formed Nd3+, Y3+: SrF2 transparent ceramics were much better than that of single crystal. On the other hand, the transmittance of the hot-formed transparent ceramics with different deformation rate reached up to 90% at 1054 nm, which is superior to the hot-pressed ceramics. Furthermore, the fracture toughness of hot-formed Nd3+, Y3+: SrF2 transparent ceramics with the deformation rate of 51% reached up to 0.70 MPa m1/2, which is nearly 1.5 times higher than that of as-grown single crystal. The full width at half maximum (FWHM) of the hot-formed ceramic is larger than that of the single crystal at 1053 nm under continuous-wave (CW) laser operation. The thermal conductivity of Nd3+, Y3+: SrF2 single crystal and hot-formed ceramics were also discussed.

High‐entropy transparent ceramics: Review of potential candidates and recently studied cases

“…Fracture SEM images of hot-formed ceramics showed a layered structure, and the number of layers was also observed to increase with an increase in deformation rate due to increased crystal plane sliding. 73 Similar XRD diffraction pattern evolution, as a function of deformation rate, was observed in Nd,Y-codoped transparent CaF 2 ceramics fabricated by the SCC method. 74 However, the SCC processing of Nd 3+ -doped Sr 9 GdF 21 and Nd,Y-codoped transparent CaF 2 ceramics exhibited a fracture microstructure with a clear grain boundary, similar to the boundaries observed in hot-pressed fluoride ceramics, but without the layered structure seen in fluoride ceramics by direct hot forming method.…”

“…XRD measurements indicated that the number of diffraction peaks increased initially, but then decreased as the deformation rate was increased from 26% to 68%. Fracture SEM images of hot‐formed ceramics showed a layered structure, and the number of layers was also observed to increase with an increase in deformation rate due to increased crystal plane sliding 73 . Similar XRD diffraction pattern evolution, as a function of deformation rate, was observed in Nd,Y‐codoped transparent CaF 2 ceramics fabricated by the SCC method 74 .…”

“…Qin et al studied crystal structure and microstructure evolution during plastic deformation of a hot Nd 3+ , Y 3+ :SrF 2 single crystal. 73 Height percentage change of a single crystal due to hot deformation was defined as the deformation rate. It was strongly influenced by the conversion process and was controlled by vary-ing the applied pressure.…”

Tough, Bioinspired Transparent Glass‐Ceramics

“…In summary, the present results demonstrate that a unique combination of optical transparency and high toughness can Figure 8. Ashby plot of fracture toughness versus Young's modulus for commercial glasses including fused silica, [2] soda-lime silicate, [16] borosilicate (Duran), [42] and aluminosilicate (Gorilla Glass 4) [43] ; transparent ceramics including yttria (Y 2 O 3 ), [44] spinel (MgAlO 4 ), [2,45] sapphire (single-crystal Al 2 O 3 ), [3b,10] , submicrometer alumina (Al 2 O 3 ), [3b] aluminum-oxynitride (AlON), [17b] magnesia (MgO), [46] zinc sulfide (ZnS), [3b] calcium fluoride, [47] strontium fluoride, [48] and apatite [49] ; and transparent glass-ceramics including combeite, [25] β-quartz solid solution, [9] and petalite-lithium disilicate. [8] Results from the current work are shown in blue circles.…”

Effect of the fluorinating agent type (NH4F, NaF, KF) on the particle size and emission properties of SrF2:Yb:Er luminophores

“…Various fluorinating agents (HF, NH 4 F, NaF, KF, NaHF 2 , KHF 2 ) can be used in the synthesis of luminophore powders. [34][35][36] This causes the sodium 37,38 and potassium 38 cations to be incorporated into the crystal lattice of strontium fluoride resulting in changes in the emission properties.…”